Cevdet Söğütlü

The effect of the process parameters in the planing processes on the surface roughness of cherry and pear woods

In this study, the effects of the process parameters in the planing processes on the surface roughness were investigated. For this purpose, the experimental samples of cherry ( Prunus avium L.) and pear ( Pirus communi s L.) wood species, which are commonly used in the Turkish decoration industry, were prepared. In preparing the experimental samples, the wood was planed tangentially and radially to the annual rings at a cutting depth of 1.4 mm in a milling machine with 4 blades 85 mm in diameter. The wood was planed into the direction of spindle rotation and in the direction against the spindle rotation at feed rates of 6, 9 and 12 m/min. The surface roughness values of the experimental samples were determined by using a stylus-type profilometer according to the ISO 4287 standards. The surface roughness was evaluated according to the R a , R z and R y principles, which were three basic parameters of the determination method for surface roughness. According to the results, when the planing parameters were differentiated, the obtained surface roughness values also acquired a different character. The feed direction of work pieces for planing in the direction of spindle rotation was lower than the feed direction in the opposite to spindle rotation for the surface roughness. Keywords : Surface Roughness, Planing, Cherry, Pear.

Carbon Dioxide Amount in the Combustion of European Oak ( Quercus petreae Liebl.) Wood Bleached and Varnished

This study was carried out to determine the carbon dioxide amount in the combustion of European oak wood (Quercus petreae liebl.) bleached and varnished. For this purpose, samples of European oak wood prepared according to ASTM D 358 contain 18% R1 = (NaOH + H2O2), R2 = (NaOH + Ca(OH)2 + H2O2), R3 = (Na2S2O5 + H2C2O4), R4 = (NaSiO3 + H2O2), R5 = (KMnO4 + Na2S2O5 + H2O2) solution groups, after bleaching with solution groups, water based (Sb), synthetic (Sn), polyurethane (Pu) and acrylic varnish (Av) were applied according to ASTM D 3023 and compliance with ASTM E 160-50 guidelines in combustion tests. Gas measurements were made with the Sigma 74172 NSU flue gas device during the combustion process. As a result, the amount of CO2 in the flame source side (ppm); the highest R4 in the varnish level (3.469), the lowest Av (1.236), the highest R4 (3.763), the lowest R2 (1.127), the highest R4 + Sb (7.583), the lowest R5 + Sb (0.8333) was obtained. Amount of CO2 in the without flame combustion temperature (ppm); the highest RV (r = 7.194), the lowest RV (3.469), the highest R1 (7.820), the lowest R2 (3.277), the highest R4 + Sv (12.73) in the lowest R3 + Pu (3.000) was found. CO2 amount in the baking combustion (ppm); (7.356), the highest RV (3.540), the lowest RV (3.565), the lowest RV (3.565), the lowest RV (3.522), the lowest R4 + Sb (1.173) was obtained. CO2 amount in the baking combustion (ppm); the highest R4 of the varnished oak wood (7.056), the lowest Av (3.522), the highest R1 (7.540), the lowest R2 (3.610), the highest R4 + Sv (9.667) in the lowest R4 + Sb (1.173) was obtained. According to this, it can be said that the solutions of R1 and R4 with synthetic varnish are not suitable for poisoning effect in fire risk areas.